[update] - to add help function to search function to readme docs

Author: lamhaison

README.md

@@ -48,8 +48,13 @@ mfa_serial = arn:aws:iam::ACCOUNT_NAME_MFA:mfa/ACCOUNT_NAME
 
 
 ## How to use
+### List all functions
+```
+aws_help
+You can search list function and after that you can run which funtion_name to get the detail of bashshell code
+```
+### Other
 ```
-# Input your MFA
 admin@MacBook-Pro-cua-Admin ~ % aws_assume_role_set_name PROFILE_NAME-dev
 You set the assume role name PROFILE_NAME-dev
 Running assume-role PROFILE_NAME-dev
@@ -73,4 +78,5 @@ admin@MacBook-Pro-cua-Admin aws_cli_results % aws_ec2_list
 |  i-0512340c9dc5fb531|  demo-dev-jenkins-master        |  x.x.x.x      |  1.123.123.123 |  running  |
 |  i-0712343f1a9565397|  demo-dev-mongodb-master        |  y.y.y.y      |  1.123.123.123 |  running  |
 +---------------------+---------------------------------+---------------+----------------+-----------+
-```
+```
+